bucket.query returns all docs when specifying the key

Take the following snippet:

MyDBClass.prototype.findDocumentsWithQuery = function(design_name, view_name, params, cb) {

var ViewQuery = couchbase.ViewQuery;
var query = ViewQuery.from(design_name, view_name);

bucket.query(query, params, function (err, results) {
if (err)

{ console.log('findDocumentsWithQuery err: ' + err); }

else

{ console.log('findDocumentsWithQuery results: ' + JSON.stringify(results)); }

return cb(err, results);
});

};

The view is 'dev_test/test':

function (doc, meta)

{ emit(meta.id, null); }

The bucket contains two documents: 'joe' and 'mat'. Issuing the following call returns both:

myDBClass.findDocumentsWithQuery('dev_test', 'test',

{ key: 'mat' }

, function (err, results)

{ console.log('main results: ' + JSON.stringify(results, null, 4)); }

);

Even if I specify key: 'footer' or even foo: bar will work!